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Changes in test_mem plugin: Use correct formula to calculate KB/s, reasonable unrolling of read/write loops to better match memory bandwidth.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25892 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andree Buschmann 2010-05-07 21:42:22 +00:00
parent 452c5b2197
commit 4c4ae04da9
1 changed files with 20 additions and 8 deletions
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28
apps/plugins/test_mem.c
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@ -26,7 +26,9 @@ PLUGIN_HEADER
#define BUF_SIZE ((PLUGIN_BUFFER_SIZE-(10<<10)) / (sizeof(int))) #define BUF_SIZE ((PLUGIN_BUFFER_SIZE-(10<<10)) / (sizeof(int)))
#define LOOP_REPEAT 8 #define LOOP_REPEAT 8
static volatile int buf[BUF_SIZE]; static volatile int buf[BUF_SIZE];
#define KB_PER_SEC(delta) ((BUF_SIZE*sizeof(buf[0])*LOOP_REPEAT/delta) >> 10)
/* (Byte per loop * loops * 100 ticks per s / ticks)>>10 = KB per s */
#define KB_PER_SEC(delta) (((BUF_SIZE*sizeof(buf[0])*LOOP_REPEAT*100)/delta) >> 10)
enum plugin_status plugin_start(const void* parameter) enum plugin_status plugin_start(const void* parameter)
{ {
@ -42,30 +44,40 @@ enum plugin_status plugin_start(const void* parameter)
{ {
unsigned i, j; unsigned i, j;
int line = 0; int line = 0;
int x; volatile int x;
int delta; int delta;
last_tick = *rb->current_tick; last_tick = *rb->current_tick;
for(i = 0; i < LOOP_REPEAT; i++) for(i = 0; i < LOOP_REPEAT; i++)
{ {
for (j = 0; j < BUF_SIZE; j++) for (j = 0; j < BUF_SIZE; j+=4)
buf[j] = j; {
buf[j ] = j;
buf[j+1] = j+1;
buf[j+2] = j+2;
buf[j+3] = j+3;
}
} }
delta = *rb->current_tick - last_tick; delta = *rb->current_tick - last_tick;
rb->screens[0]->clear_display(); rb->screens[0]->clear_display();
rb->screens[0]->putsf(0, line++, "%s", boost?"boosted":"unboosted"); rb->screens[0]->putsf(0, line++, "%s", boost?"boosted":"unboosted");
rb->screens[0]->putsf(0, line++, "bufsize: %u", BUF_SIZE*sizeof(buf[0])); rb->screens[0]->putsf(0, line++, "bufsize: %u", BUF_SIZE*sizeof(buf[0]));
rb->screens[0]->putsf(0, line++, "loop#: %d", ++count); rb->screens[0]->putsf(0, line++, "loop#: %d", ++count);
rb->screens[0]->putsf(0, line++, "write ticks: %d (%d kB/s)", delta, rb->screens[0]->putsf(0, line++, "write ticks: %2d (%5d KB/s)", delta,
KB_PER_SEC(delta)); KB_PER_SEC(delta));
last_tick = *rb->current_tick; last_tick = *rb->current_tick;
for(i = 0; i < LOOP_REPEAT; i++) for(i = 0; i < LOOP_REPEAT; i++)
{ {
for(j = 0; j < BUF_SIZE; j++) for(j = 0; j < BUF_SIZE; j+=4)
x = buf[j]; {
x = buf[j ];
x = buf[j+2];
x = buf[j+3];
x = buf[j+4];
}
} }
delta = *rb->current_tick - last_tick; delta = *rb->current_tick - last_tick;
rb->screens[0]->putsf(0, line++, "read ticks: %d (%d kB/s)", delta, rb->screens[0]->putsf(0, line++, "read ticks : %2d (%5d KB/s)", delta,
KB_PER_SEC(delta)); KB_PER_SEC(delta));
rb->screens[0]->update(); rb->screens[0]->update();